exaples/softuart: add basic example for softuart

examples/softuart/LICENSE

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+The MIT License (MIT)
+
+Copyright (C) 2016 Bernhard Guillon <Bernhard.Guillon@web.de>
+Copyright (c) 2015 plieningerweb
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

examples/softuart/Makefile

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+PROGRAM = softuart
+EXTRA_COMPONENTS = extras/softuart
+ESPBAUD = 460800
+include ../../common.mk

examples/softuart/main.c

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+/*
+ * Softuart example
+ *
+ * Copyright (C) 2016 Bernhard Guillon <Bernhard.Guillon@web.de>
+ * Copyright (c) 2015 plieningerweb
+ *
+ * MIT Licensed as described in the file LICENSE
+ */
+#include <esp/gpio.h>
+#include <esp/uart.h>
+#include <espressif/esp_common.h>
+#include <stdio.h>
+#include "softuart/softuart.h"
+
+void user_init(void)
+{
+    // setup real UART for now
+    uart_set_baud(0, 115200);
+    printf("SDK version:%s\n\n", sdk_system_get_sdk_version());
+
+    // setup software rx to 9600 8n1
+    softuart_init(9600);
+
+    while (true)
+    {
+        if (!softuart_available())
+            continue;
+        printf("%c",softuart_read());
+    }
+}